I carry a small eddie bower back pack (like school book size, not tiny!), with my wallet, which is a tiny purse all its own with a shoulder strap, and fairly often my knitting bag, which is soon to be a Knitting Zen tote bag, 'cause the one I've got now is from one of the LYS who I don't like very well (they gave it to me years ago when there were nicer people working there), plus I've got the kid's back pack (big eddie bower one) with a few changes of clothes for her that's alwyas in the car but doesn't have to go in places much.

So Let's see:

Back Pack
1. wallet
2. screwdriver w/ multi points
3. mini mag light
4. a pen/pencil/highlighter if no one's swiped them
5. my "life" a day timer with its own pen & pencil
6. spare bandanna to keep my hair out of my face
7. a few hair sticks (same as above)
8. a brush, sometimes
9. some hair bands
10. a zippy bag with a few toiletries, bandaids, condoms, lotion, nail trimmer & file, etc
11. my check book
12. savings act book
13. return address labels
14. a little auto everything camera
15. spare glad rag
16. kid's folding toilet seat (sometimes) (big toilets are frightening when you're two evidently.)
17. sometimes a knitting project or two
18. sometiems a book I'm reading
19. spare medications & tylonol & advil

Then the knitting bag has the rest of the projects in progress, and a whole bunch of things I might need (less since I got a bin at home to keep needles in - I was carrying them all around with me!

Oh, and two pocket knives in my pocket, plus baby nail trimmers, the cell phone & car keys if I'm not at home, sometiems some money, and whatever bits of paper had important info on them that I shouldn't loose, which works until I wash the jeans in question.

And I suspect there's a bunch more misc junk that I shift in and out depending on where I'm going, or where I need to remember to take it.